Conduit.



No. 703,447. 'Patented my l, |902.'

. vw. L. mGowAu.

CONDUIT.

(Applicatioxi led Feb, 8, 1902.)

(No Modal.)

UNITED STATES PATENT OFFICE.

WILLIAM L MocowAN, oE PHILADELPHIA,PENNSYLVANIA.

CONDUIT.

SPECIFICATION forming part of Letters Patent No. 703,447, dated July 1, 1902.

Application led February 8,'1902. Serial No. 93,121. (No model.)

T 7l/ZZ whom it may concern.:

Be it known thatLWILLIAM L.` McGoWAN,

`of the city and county of Philadelphia and that class of conduits which are formed of the other section.

sections divided internally by longitudinal partitions into a series of compartments intendedfor electric cables, thefsections being butted together and united to form acontinuous conduit. Usually thesections have been held in alinement by dowel-pins and have been .united by cement joints. Much difficulty has been experienced in conduits of this character in properly forming a tight and strong joint between the sections, and if for any cause it is necessary to undermine the conduit all other support is removed andthe weight ofY the sections, with their load, fallsY Wholly upon the concrete or cement bond and the dowel-pins, and rupture frequently occurs. The use of dowel-pins is unsatisfac-A tory, and it frequently'happens that owing to the inequality in the shrinkage of different sections during the burning of the terracotta, of which they are formed, the pin-holes in the ends of adjacent sections are not in perfect alinement, and consequentlythe dowelpins cannot be used and the cement alone must be relied upon for the union.

It is the object of my invention to provide the sections with a joint which will insure a tight and strong union capable of 'withstandi partition-walls at one end' of thek section beyond the outer body-walls, so as to form acentral projection composed of the internal partition-walls, and I, provide the adjacent end of the next section with a complementary socket formed byabbreviating or shortening the internal partition-walls -to an extent corresponding with their extensiony in In practice each section will be ordinarily provided with the extension of the partition-walls at one end and the com'- plementary abbreviation or shortening at the other. When the sections are placed together to form a continuous conduit, the ends of the outer body are butted together, `and the pro-y jection' formed by the extension of the innerl partition-walls at one end of one section fits inthe complementary recess formed by the abbreviation of the partition-walls in the end ofthe adjacent section, thus permitting aV tight joint tobe formed by-whicli transverse strainsv at the joints are transmitted to the abutting sections.

. In thedrawings, Figure lis a view of a portion of a conduit formed of sections embodying my invention, one section being shown in plan and the other in longitudinal horizontal section. Fig. 2 is a perspective view of the end of one of the sections, illustrating one form. Fig.y 3 is a longitudinalsection, enlarged, showing the joint formed by two -sec-` tions. Fig. et is a view similar'to Fig. l, but illustrating the sectious with curved or spherical ends; and Fig. 5 is a perspective view of the end of one of the sections of the form shown in Fig.' 4. l.

A is the tubular body, provided with longitudinal walls or partitions C, dividing the section internally into a series" of longitudinal cable-compartmentsB. These internal walls or partitions C are not coextensive with the outer wallsA of the section, but are projected or extended at one end in extensions or projecting portions D beyond the end F of the outer-body, While at the'other end they do not extend-up to the end Gof the outer body, but terminate,as at l-I, and thus form a recess or socket complementary to the projection or extension D at the other end. Inthe construction shown in Figs. l and 2 this extensionof the four partitions C forms acrossshaped projection, the ends offth'ejarmsof which are perfectly reduced or tapered, as at d, and the ends of the walls C at theother Vend are correspondingly tapered, as at h. The

struction shown in Figs. 3, 4, and 5 the projecting ends D are curved on their faces, so as to form aconcave or spherical projection, and

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the ends of the partitions at the other end are formed with a complementary concave face.

In placing the sections together to form a continuous conduit the projection D, formed by the extended partition-walls of one section, is fitted into the complementary recess H, formed by the abbreviation of the walls of the next section. The sections are fitted together to form a tight joint, with the ends F G of the outer bodies butted together, which is then enveloped in the cement or concrete I in the usual manner. A very strong union is thus formed, which is capable of withstanding heavy lateral pressure without rupture. As the ends t within one another there will be no possibility of any gap or open space between the ends, even if the ends of the outer body are slightly uneven. If desired, the projection D, formed by the extension of the partition-walls, may be formed with a knob or projection E, adapted to enter a recess or socket c in the socketed ends of the walls of the other section. This serves to center the sections, and in the construction shown in Figs. 3, 4, and 5 it permits of a lateral or angular adjustment of one section with reference to the other without shifting the central point of union. I do not, however, claim the use of this button and socket in connection with the spherical projecting end and recess, as that forms part of the subject-matter of my application No. 79,676, tiled October 28, 1901.

It is apparent that when the extremities of the sides of the ends of the outer body A are made curved or irregular, as at F and G in Figs. 4 and 5, the ends F are provided with projections which will engage with the complementary recesses in the extremities of the sides of the ends G and lock the sections against lateral displacement, irrespective of the interlocking through the projection D and recess H of the partition-walls. This means of interlocking may be used in some cases without the projection and recessing of the partition-walls or in cases where the partition-walls are not employed. The details of construction shown may be varied without departing from the invention.

What I claim as new, and desire to secure by Letters Patent, is as follows:

1. A conduit-section consisting of a tilbular outer body having longitudinal partitions or walls dividing it internally into a series of longitudinal ducts, said dividing or partition walls at one end being extended beyond the ends of the walls of the outer body to form a projection composed of said partitions, and at the other end being abbreviated to terminate within the end walls of the outer body to form a recess or socket complementary to the projection of the partition-walls at the other end.

2. A conduit-section consisting of a tubular outer body having longitudinal partitions or walls dividing it internally into a series of longitudinal ducts, said dividing or partition walls at one end being extended beyond the ends of the walls of the outer body to form a projection composed of said partitions, and at the 'other end being abbreviated to terminate within the end walls of the outer body to t'orm a recess or socket complementary to the projection of the partition-walls at the other end, the faces of said projecting and abbreviated ends of the partition-walls being tapered or inclined.

3. A conduit-section consisting of a tubu lar outer body having longitudinal partitions or walls dividing it internally into a series of longitudinal ducts, said partition-walls at one end being extended beyond the ends of the walls of the outer body to forni a projection composed of said partitions. l

4. A conduit-section consisting of a tubular outer body having longitudinal partitions or walls dividing it internally into a series of longitudinal ducts, said partition-walls at one end being abbreviated or terminated within the bounding edges of the outer body and at a distance therefrom, to form a recess or socket between the ends of the partitions and the end of the outer body.

5. A conduit having two hollow sections of polygonal cross-section provided with dividing-Walls of which the extremities of the dividing-Walls of the end of one section are provided with projections beyond the end of the section and the extremities of the dividingwalls of the end of the other section are provided with recessed portions within the end of the section and complementary to the projections on the end of the irst section.

In testimony of which invention I have hereunto set my hand.

WM. L. MCGOVVAN.

Witnesses:

ELIAS NUSBAUM, ERNEST HOWARD HUNTER.

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